Enables Infobars Phase 1

Bug: 870151
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8e1fc458e9316be19e35b5e0f3edaefb5d3244f3
Reviewed-on: https://chromium-review.googlesource.com/1132564Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580159}

ios/chrome/browser/ui/ui_util.mm

@@ -58,7 +58,7 @@ bool IsIPhoneX() {
 }
 
 bool IsRefreshInfobarEnabled() {
-  return base::FeatureList::IsEnabled(kInfobarsUIReboot);
+  return base::FeatureList::IsEnabled(kUIRefreshPhase1);
 }
 
 bool IsRefreshLocationBarEnabled() {